Cracking Code Breakers (KS2)

Discover how postal engineers built Colossus and cracked wartime codes.

Cracking Code Breakers school workshop at The Postal Museum

KS2 Computing, History, Science, Technology, Engineering, Maths
Suitable for Years 5 – 6 (differentiated for year group)

In this workshop

Help Chief Post Office engineer Tommy Flowers to build Colossus, an early computer that cracked top secret messages from Hitler! Step inside the Post Office Engineering Research Station at Dollis Hill, brought to life through archival film and real objects. Learn about codes and ciphers, take on engineering tasks, and reconstruct Colossus to reveal its vital role in the D-Day landings.

Availability: Tuesday, Wednesday and Thursday

Duration: 45 minutes

Cost per workshop: £100 +VAT (£120 inc. VAT)

Group size: 35 pupils max, up to 3 classes per day

Adult : pupil ratio (KS2) 1:6 (plus SEND support staff)

Book your visit today


Prepare for your visit: Cracking Code Breakers challenges accredited by the British Science Association.

Make a day of your school visit

Book a Mail Rail ride.


Cracking Code Breakers is generously supported by: